cross a homozygous running, homozgous black mouse with a heterozgous running brown mouse.

Need to know which traits are dominant or recessive. Please repost with adequate data.

Thanks for asking.

To determine the possible outcomes of crossing a homozygous running, homozygous black mouse (RRBB) with a heterozygous running brown mouse (RrBb), we need to understand the principles of Mendelian genetics and the laws of inheritance.

Step 1: Understand the genotypes of the parent mice:
- Homozygous running, homozygous black mouse: RRBB (homozygous for running and black traits)
- Heterozygous running brown mouse: RrBb (heterozygous for running and brown traits)

Step 2: Determine the possible gametes produced by each parent:
- Homozygous running, homozygous black mouse (RRBB) will produce only one type of gametes: RB
- Heterozygous running brown mouse (RrBb) will produce four different types of gametes: RB, Rb, rB, and rb

Step 3: Set up a Punnett square to predict the offspring genotypes:

| RB | Rb | rB | rb |
-----------------------------------------------------
RRBB | RB | RB | RB | RB |
-----------------------------------------------------
RrBb | RB | Rb | rB | rb |

In the Punnett square, we combine the possible gametes from each parent to create potential offspring genotypes. The letters represent the alleles for the running and color traits.

Step 4: Analyze the Punnett square to determine the offspring genotypes:
The possible genotypes of the offspring are:
- RB (running, black)
- Rb (running, brown)
- rB (not running, black)
- rb (not running, brown)

Step 5: Analyze the Punnett square to determine the offspring phenotypes:
The possible phenotypes of the offspring are:
- Running and black
- Running and brown
- Not running and black
- Not running and brown

In summary, the potential offspring from crossing a homozygous running, homozygous black mouse (RRBB) with a heterozygous running brown mouse (RrBb) would have a combination of running, non-running, black, and brown phenotypes.